Follow-up: if RAO occurs, 1 hour occlusion of homolateral ulnar artery could be attempted in order to increase flow and restore patency in occluded radial artery (25); if RAO persists, LMWH (100 u/Kg x 2/die) should be administered for 14-30 days (6). EchoDoppler follow-up at 1-3 months will be performed to check patency of occluded radial artery.